Christie is praising the big zero for doing his job. Let’s see if those words translate into something useful, like rapid clean-up and help getting power restored. It’s not thaumaturgy to do the right thing.
I’m not sure what role the POTUS has in getting power restored. It seems to me to be standard procedure for utilities in non-affected areas to send crews to affected areas. I’m assuming they have standard reciprocity agreements to do this.